Facebook Ads Character Limits: Headlines, Text & Descriptions
Facebook ad headlines get just 40 characters — roughly 6-8 words — while primary text technically allows more but truncates at 125 characters on most placements. Here's how to write Facebook ad copy that fits and converts.
Facebook Ad Character Limits
| Field | Limit | Strategy |
|---|---|---|
| Headline | 40 characters | Lead with the benefit, not the brand name |
| Primary text | 125 characters (reliable) | Front-load your message before the "See more" cutoff |
| Description | 30 characters | Appears below headline in some placements |
| Link description | 30 characters | Optional context under the headline |
| Call-to-action button | Fixed options | Choose from preset labels (Shop Now, Learn More, etc.) |
For the complete interactive reference with all fields for every platform, visit our all-platforms character limit cheat sheet — with 16 platforms in one page and links to dedicated tools for each.
Why 40 Characters Is So Tight
Facebook's ad headline limit of 40 characters is one of the strictest in digital advertising — tighter than a Google Ads headline (30 characters, but you get up to 15 of them) and far tighter than an organic Facebook post. With only 6-8 words available, every word needs to earn its place: a clear benefit statement, a number, and a strong verb is usually the most you can fit.
Writing Within the 125-Character Primary Text Cutoff
The primary text field accepts more than 125 characters, but only the first 125 display reliably across all placements — especially mobile, where most Facebook ad impressions happen. Treat 125 characters as your real limit: write your key message and call to action within that window, and let anything beyond it be a bonus for readers who expand the ad.
Facebook Ad Copy Formula
- Headline: benefit + number where possible (e.g., "Save 30% Today" — 14 characters)
- Primary text: hook in the first sentence, offer in the second, urgency in the third
- Avoid repeating your headline in your primary text — use the space to add new information
- Test 2-3 headline variants per ad set; Facebook's delivery system will favor the best performer
See our full Facebook character limits guide for every field, and ideal Facebook post length for organic content. For comparable ad copywriting under tight constraints, see our Google Ads copy tips, RSA headline tips, and Performance Max asset limits. Amazon sellers running Facebook traffic to listings may also find our Amazon listing optimization guide useful.
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